1 files changed, 65 insertions, 0 deletions
diff --git a/src/glsl/link_uniform_blocks.cpp b/src/glsl/link_uniform_blocks.cpp
new file mode 100644
index 00000000000..c9cbde95b6f
--- /dev/null
+++ b/src/glsl/link_uniform_blocks.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "main/core.h"
+#include "ir.h"
+#include "linker.h"
+#include "ir_uniform.h"
+#include "program.h"
+
+bool
+link_uniform_blocks_are_compatible(const gl_uniform_block *a,
+				   const gl_uniform_block *b)
+{
+   assert(strcmp(a->Name, b->Name) == 0);
+
+   /* Page 35 (page 42 of the PDF) in section 4.3.7 of the GLSL 1.50 spec says:
+    *
+    *     "Matched block names within an interface (as defined above) must
+    *     match in terms of having the same number of declarations with the
+    *     same sequence of types and the same sequence of member names, as
+    *     well as having the same member-wise layout qualification....if a
+    *     matching block is declared as an array, then the array sizes must
+    *     also match... Any mismatch will generate a link error."
+    *
+    * Arrays are not yet supported, so there is no check for that.
+    */
+   if (a->NumUniforms != b->NumUniforms)
+      return false;
+
+   if (a->_Packing != b->_Packing)
+      return false;
+
+   for (unsigned i = 0; i < a->NumUniforms; i++) {
+      if (strcmp(a->Uniforms[i].Name, b->Uniforms[i].Name) != 0)
+	 return false;
+
+      if (a->Uniforms[i].Type != b->Uniforms[i].Type)
+	 return false;
+
+      if (a->Uniforms[i].RowMajor != b->Uniforms[i].RowMajor)
+	 return false;
+   }
+
+   return true;
+}